Oil burner with concentric troughs



June 14, 1960 OIL BURNER WITH CONCENTRIC TROUGHS Fig./'

Fig.2

c. c. GRANGER 2,940,519

Filed Sept. 21, 1956 22 20 32 /2 18 30 I l 21-: 24 50 45 a A /6 26 Char/es Craddoc/r Granger IN V EN TOR.

United States Patent 2,940,5ra on BURNER WITH CONCENTRIC TROUGHS Charles CraddockGranger, 1203 Chestnut St,

. Henderson, N.C.

Filed Sept. 21, 1956, Ser. No. 611,214 2 Claims. (Cl. 158-41 The present invention 'relates'to an oil burner which is expressly designed and adapted for eificient use in a tobacco drying and curing barn in conjunction with flue means, stack and other compleme'rit'al equipment. More particularly, the invention pertains to a structurally and functionally improved burner plate and flame spreader and flue adapter supported on and by way of said burner plate.

Another object of the invention is to provide a structure which is susceptible of ready and economical manufacture and sale and is such in over-all construction that it makes for more expedient assembling and installation and provides for expedient repairs and, whenever necessary, replacements of parts.

Another objective, an outstanding aim in fact, is to structurally, functionally and otherwise improve upon similarly constructed and performing prior art tobacco curing burners, for example, the burner covered in Patent- 2,612,945, granted to me under date of October 7, 1952. The nature of the improvements herein revealed will be more readily understood, it is believed, by referring, if only briefly, to Patent 2,612,945. In so doing, it will be ascertained that the patented construction is characterized by a unitary burner casting embodying an annular channel circumscribing and forming an endless oil ring. The inner wall of the channel defines an unobstructed airway communicating with a central opening in the casting. A circular horizontal imperrorate flange is integral with and on a plane with the bottom and radiates from the outer wall of the channel and has an outer marginal lip which combines with the flange and defines a relatively shallow oil overflow and draining trough. Suitable supporting legs, an air deflector cone or spreader, flue adapter and other components, such as suitable pipes connected with the troughs or channels are also utilized.

In the stated patent a three-part housing is employed and characterized by an annular base supporting a ringlike plate or collar which, in turn, supports the truncated conical hood or flue adapter. In the instant simplified construction the stated annular base and collar are dispensed with. instead a flange is formed as an integral part of the burner plate or casting and this flange serves to more effectually support the flue adapter and permits the use of a larger flue adapter. which hoods over the entire burner plate.

The improved construction also relies for novelty on the utilization of inner and outer troughs with the adjacent walls of the respective troughs integrated to define a relatively thick divider or partition which paves the way for the formation of a first group efficiently performing arcuate circumferentially spaced air slots. The construction is also novel in that the junctional portion between the flange and outer wall of the outer channel is apertured to provide a second group of complemental arcuate circumferentially spaced slots.

Other objects, features and advantages will become more readily apparent from the following descriptionand the accompanying illustrative drawings.

here referred 'to as aflange and is Patented June 14, 1960 ice In the accompanying drawings wherein like numerals are employed to designate like parts throughout the views:

Figure 1 is a view showing the plate proper in plan and which view maybe said to be taken on the horizontal line 11- 1 of Figure 2; and,

Figure 2, in turn, is a view in section and elevation taken on the central line 22 of Figure :1.

With reference to the drawing and particularly to Fig. 2, the unitary casting is denoted by the numeral 4 and is characterized by a circular burner plate. This has a central air opening 6 andis cast to provide an inner endless channel or trough 8 having an inner endless wall 10 circumscribin'g the margin of the air opening 6 and an outer concentric wall-12. It is to be noted that the upper edge portion of the inner wall 12, that is, the edge portion 14 rises to 'a plane which is slightly above the terminal upper edge of the outer wall '12. The second or outer trough is denoted at 16 and this encircles the inner trough in concentric relationship and is of the same crosssectional depth and is coplanar with the first trough and in fact is substantially identical in construction with the rst trough. The inner wall thereof is denoted at '13 and the outer coplanar wall by the numeral 29. It is to be noted that the walls 12 and 18 are integrated into a relatively thick twin-wall which is here referred to conveniently as a partition or divider. This, in turn, is provided with circuniferentially spaced elongate arcuate air slots 22 which open as shown through the top and bottom portions of the casting or plate. Reference is made now to the relatively thinner marginal edge portion which is denoted by the numeral 24. The inner peripheral or junctional portion thereof is provided with equidistant circu-mferentially spaced air slots 26 and these are spaced inwardly from an upstanding retainer rib 28. The rib is therefore midway between the inner and outer peripheral edge portion of the flange.

Inother words, the rib is spaced outwardly from the slots 26 and inwardly from the outer peripheral edge and against displacement by way of the cooperating retainer rib 28 in an obvious manner.

The numeral 36 designates an oil supply or inlet pipe having a vertical branch 38 extending through the bottom of the inner channel or trough 8 in the manner shown. A substantially diametrically opposite oil overflow pipe is denoted at 4 3 and this has a vertical branch 42 beneath the outer trough and the upper end portion 44 of the branch extends not only through the bottom but up and into the trough and terminates below the upper edges of the inner and outer walls of said trough. At this same point, there is a communicating notch or passage 46 which is formed in the so-called partition and allowing the oil to overflow from the inner trough into the outer one in a satisfactorily controlled manner. It is to be noted, too, that the cross-section of the flange 24 is such that the bottom of the flange is in a plane well above the bottom portions of the troughs. Attached to the underside of the flange are depending suitably spaced and constructed support legs 45.

The conical flame spreader is denoted by the numeral 43 and has lugs 50 on its bottom telescoping into the burners and for this reason I find it unnecessary to dwell upon how these burners function to bring about efiective tobacco curing results. I am concerned primarily with the structural details and their relationship and, my claims are presented accordingly; V 'When installing, be sure to level burner in order to troughs, said divider having elongated arcuate circummaintain a balanced flame arou'nd same; This canfbest be done by turning oil control-valve on until oil fills burner plate, then adjust until oil is-level in plate.

When lighting the burner, be sure that safety cut-off valve is open and properlyconnected to cable and fuse link. Open the toil control valve and wait until oil can he been in burner plate. Turn control valve back to low fire, saturate a small piece of paper in oiLand drop it under burner. Allow about ten minutes for the burner to warm up before turning control valve to a higher heat 7 stage. Never light the burner while'it is hot, let itcool until'the bare hand can be held on burner.

To raise the heat properly open oil 'control-ivalves graduallyallowing two or three hours forheat to reach the desired stage, each time temperature can be raised in either side of barn by raising controls separately:

ferentially spaced air slots opening through the 'top and bottom portions of said divider, an annular flange encircling the outer wall of said outer trough and having its inner peripheral portion integral with the upper portion of said last named outer wall andits top side flush with the upper edge of said last-named outer wall, said annular flange being provided on said top side with an upstanding ada'pted retaining rib and'said rib being located concentrically inward of the 'outer-t peripheral edge of said flange and that portion. of the top side of the flange between said rib and the outer peripheral edge being flat and serving as an endless ledge, support legs attached to and depending from, the bottoniyside of said flange, an

The foregoing is considered as illustrative only of the principles of the invention-i, Further, sincenumerous 1 modifications and changes .will readily occur-to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, allsuitable' modifications and equivalents may be resorted to, falling within-the scope of the invention as claimed.

' What is claimed as new is as follows:

1.111 a portable and sectional tobacco barn oil burner,

a unitary castingcomprising a circular burner plate having a central air opening, an inner endless trough channellike in cross-section embodying an inner endless wall circumscribing the margin of said air opening, and a concentric outer wall,.said inner wall having an upper edge portion rising to a plane slightly above the plane of a corresponding upper edge of said outer wall, an outer endless trough complemental to and surrounding said inner trough and substantially identical in construction therewith, said outer trough also having an inner wall inte gralWith the-outer Wall of said inner 'trouglnsaid last tnamed inner and outer walls; conjointly considered, being twice the cross-sectional thickness of the inner wall 7 a of the inner trough and outer wall of-the outertrough and providing a divider between said inner and outer oil inlet pipe communicatively connected with the bottom ofsaid innertrough, and an oil overflow pipe communicatively connected with said outer trough, saidflange being ofv a crosseseetional-thickness'appreciably less than ;the depth of, said troughs, the bottoms of said'troughs lying in a plane below the bottom side of the flange, said flange having additional air slots therein continguous to the outer wall of' the outer trough, said rib being spaced outwardly of the locale of said last-named air slots, and the supperedge portion-of said divider having a shallow overflow notch therein adjacent the co-operating end of said overflow pipe. 7 1 r 2. The structure defined in claim 1, and in combination 1 with said structure, an air deflector cone disposed over References Cited in the tile of this patent UNITED STATES PATENTS.

1,293,194 Preiss g Feb. 4, 1919 71,458,774 Meyers June 12, 1923 1,530,079 Hood Mar. 17, 1925 1,573,654 Stockstrom Feb. 16, 1926 1,605 ,488 Votava Novz2, 1926 2,468,450 Koszewski Apr. 26, 1949 Nagel 10'ct. .4, 949 

